Square battery structure and manufacturing method thereof
By designing the positive electrode ear and negative electrode ear arranged on the same side in the square battery, and using the conductive connection between the insulated current collecting plate and the current collecting column, the problem of long lead-out path of the negative electrode ear is solved, and a battery manufacturing with simple structure, low cost, high reliability and convenient automation production is achieved.
Patent Information
- Application Number
- CN202510697101.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-28
- Publication Date
- 2025-07-22
AI Technical Summary
The lead-out path of the negative electrode ear in existing square batteries is long, and additional components are needed to be added for conductive connection, resulting in complex structure, high cost, poor reliability and safety, and is not conducive to automated production.
A square battery structure is designed, in which the positive electrode ear and negative electrode ear of each core are located on the same side. The combined current collecting disk is equipped with an insulated positive electrode current collecting plate and a negative electrode current collecting plate. The combined cover plate is equipped with an insulated positive electrode current collecting column and a negative electrode current collecting column. The electrode ear at the top of the core is directly conductively connected through the current collecting plate and the current collecting column, and additional conductive connection components are omitted.
It simplifies the battery structure, reduces production costs, improves reliability and safety, and facilitates automated production and manufacturing.
Smart Images
Figure CN120357047A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of manufacturing square batteries, and more specifically, to a square battery structure and a manufacturing method thereof. Background Art
[0002] Existing square batteries mainly consist of a square outer shell, multiple wound cores, a combined current collector plate, and a combined cover plate, etc. The multiple wound cores are inserted into the square outer shell through the ports at the top of the square outer shell, then the combined current collector plate is installed on the top of the multiple wound cores, and finally the combined cover plate is installed on the top of the combined current collector plate to cover and seal the ports. At this time, the positive electrode tabs at the ends of the multiple wound cores all need to be jointly welded to the positive current collector plate of the combined current collector plate to lead out the positive current, and the negative electrode tabs at the ends of the multiple wound cores all need to be jointly welded to the negative current collector plate of the combined current collector plate to lead out the negative current. However, in traditional square batteries, the positive electrode tabs and negative electrode tabs of each wound core are respectively arranged at the top and bottom of the wound core. Therefore, in actual use, since the positive electrode tabs at the top of the multiple wound cores are exactly located at the ports at the top of the square outer shell, that is, directly close to the combined current collector plate, the multiple positive electrode tabs can be easily welded and fixed to the positive current collector plate of the combined current collector plate to form an electrical connection. However, the negative electrode tabs at the bottom of the multiple wound cores are located at the bottom of the square outer shell, that is, far from the combined current collector plate. Then, the multiple negative electrode tabs need to be conductively connected together at the bottom first, and then connected upward from the side of the square outer shell to the negative current collector plate of the combined current collector plate. In this way, due to the long lead-out path of the negative electrode tabs, additional components often need to be added for conductive connection, which not only increases the complexity of the structural design and raises the production cost of the product, but also affects the reliability and safety of use, and makes the manufacturing process more troublesome and is not conducive to automated production manufacturing. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a square battery structure and a manufacturing method thereof with simple structure, low manufacturing cost, reliable and safe use, more convenient manufacturing, and conducive to automated production manufacturing.
[0004] The technical problem of the present invention is realized through the following technical solutions: A square battery structure includes a square outer shell, a plurality of wound cores, a combined current collector plate, and a combined cover plate. The top of the square outer shell is provided with a port, and the plurality of wound cores are jointly inserted into the square outer shell through the port. The top end of each wound core is provided with a positive electrode tab and a negative electrode tab arranged on the same side; the combined current collector plate is provided with a positive current collector sheet and a negative current collector sheet, and the positive and negative current collector sheets are insulated from each other; the combined cover plate is provided with a positive current collector post and a negative current collector post, and the positive and negative current collector posts are insulated from each other; the combined current collector plate is installed on top of the plurality of wound cores, and the combined cover plate is installed on top of the combined current collector plate and covers and seals the port; the positive electrode tabs at the top ends of the plurality of wound cores are jointly conductively connected to the positive current collector sheet, and then the positive current collector sheet is conductively connected to the positive current collector post to lead out the positive current; the negative electrode tabs at the top ends of the plurality of wound cores are jointly conductively connected to the negative current collector sheet, and then the negative current collector sheet is conductively connected to the negative current collector post to lead out the negative current.
[0005] The plurality of wound cores are arranged in a manner that they are closely arranged in rows horizontally and multiple columns vertically. The horizontal direction is the length direction of the square outer shell, and the vertical direction is the width direction of the square outer shell; the positive electrode tabs at the top ends of the plurality of wound cores are all located on the same horizontal straight line in the same row, and the negative electrode tabs at the top ends of the plurality of wound cores are also all located on the same horizontal straight line in the same row.
[0006] Both the positive current collector sheet and the negative current collector sheet are straight long strips extending horizontally, and the positive current collector sheet is simultaneously conductively connected to the positive electrode tabs in the same row, and the negative current collector sheet is simultaneously conductively connected to the negative electrode tabs in the same row.
[0007] There are multiple rows of the positive electrode tabs, and correspondingly, there are multiple pieces of positive current collector sheets with the same number of rows as the positive electrode tabs. Each piece of positive current collector sheet is correspondingly connected to a row of positive electrode tabs, and each adjacent two pieces of positive current collector sheets are conductively connected through a positive conductive sheet; there are multiple rows of the negative electrode tabs, and correspondingly, there are multiple pieces of negative current collector sheets with the same number of rows as the negative electrode tabs. Each piece of negative current collector sheet is correspondingly connected to a row of negative electrode tabs, and each adjacent two pieces of negative current collector sheets are conductively connected through a negative conductive sheet.
[0008] Two rows of the positive electrode tabs are arranged adjacent to each other, and these two rows of positive electrode tabs are jointly conductively connected by the same piece of positive current collector sheet. Two rows of the negative electrode tabs are arranged adjacent to each other, and these two rows of negative electrode tabs are jointly conductively connected by the same piece of negative current collector sheet.
[0009] The positive current collector post is conductively connected to the positive current collector sheet through a positive connection bar, and the negative current collector post is conductively connected to the negative current collector sheet through a negative connection bar. Insulating tubes are sleeved outside the positive connection bar and the negative connection bar.
[0010] The described combined current collector plate is provided with slot holes. The positive current collector plate and the negative current collector plate are both installed on the bottom surface of the combined current collector plate, and the positive connection strip passes through the slot holes to conductively connect the positive current collector plate, and the negative connection strip passes through the slot holes to conductively connect the negative current collector plate.
[0011] The described combined cover plate is provided with a liquid injection hole for injecting electrolyte and a sealing nail for closing the liquid injection hole, and is also provided with an explosion-proof valve.
[0012] A plurality of installation grooves are provided in the described square shell, and the plurality of wound cores are respectively loaded into the plurality of installation grooves one by one.
[0013] A manufacturing method of a square battery structure includes the following steps: Step 1: Select a square shell with a reserved port at the top and a closed bottom, and set a plurality of installation grooves in the square shell; Step 2: Load the plurality of wound cores into the plurality of installation grooves one by one, and arrange the plurality of wound cores in the installation grooves in a manner that they are closely arranged in rows horizontally and multiple columns vertically. The horizontal direction is the length direction of the square shell, and the vertical direction is the width direction of the square shell. At the top of each wound core, there are a positive electrode tab and a negative electrode tab arranged on the same side; Step 3: Adjust the installation position of each wound core in each installation groove so that the positive electrode tabs at the top of the plurality of wound cores are all located on the same horizontal straight line in the same row, and the negative electrode tabs at the top of the plurality of wound cores are also all located on the same horizontal straight line in the same row; Step 4: Install the combined current collector plate with the positive current collector plate and the negative current collector plate installed on the bottom surface on the top of the plurality of wound cores, and make the positive current collector plate conductively connect the positive electrode tabs in the same row at the same time, and the negative current collector plate conductively connect the negative electrode tabs in the same row at the same time; Step 5: Connect the positive current collector column on the combined cover plate to the positive current collector plate through the positive connection strip passing through the slot holes on the combined current collector plate, connect the negative current collector column to the negative current collector plate through the negative connection strip passing through the slot holes on the combined current collector plate, and then install the combined cover plate on the top of the combined current collector plate and cover and seal the port at the top of the square shell; Step 6: Inject electrolyte into the square shell through the liquid injection hole on the combined cover plate. After the injection is completed, close the liquid injection hole with the sealing nail, and then the manufacturing of the square battery can be completed.
[0014] Compared with the prior art, in the present invention, multiple cores are jointly inserted into a square housing through a port at the top of the square housing, and the top end of each core is provided with a positive electrode tab and a negative electrode tab arranged on the same side. Then, a positive current collector sheet and a negative current collector sheet are provided on the combined current collector plate, and the positive and negative current collector sheets are insulated from each other. In addition, a positive current collector post and a negative current collector post are provided on the combined cover plate, and the positive and negative current collector posts are insulated from each other. Then, the combined current collector plate is installed on the tops of the multiple cores, and the combined cover plate is installed on the top of the combined current collector plate and covers and seals the port. Finally, the positive electrode tabs at the tops of the multiple cores are jointly conductively connected to the positive current collector sheet, and then the positive current collector sheet is conductively connected to the positive current collector post to lead out the positive current. The negative electrode tabs at the tops of the multiple cores are jointly conductively connected to the negative current collector sheet, and then the negative current collector sheet is conductively connected to the negative current collector post to lead out the negative current. Obviously, since the top end of each core is provided with a positive electrode tab and a negative electrode tab arranged on the same side, that is, the positive electrode tabs and negative electrode tabs of the multiple cores are directly close to the combined current collector plate, and the multiple cores are arranged in a manner of being closely arranged in rows horizontally and in multiple columns vertically, so that the positive electrode tabs at the tops of the multiple cores are all located on the same horizontal line in the same row, and the negative electrode tabs at the tops of the multiple cores are also all located on the same horizontal line in the same row. Therefore, the positive current collector sheet can conveniently conductively connect the positive electrode tabs in the same row at the same time, and the negative current collector sheet can also conveniently conductively connect the negative electrode tabs in the same row at the same time. In this way, since the lead-out paths of the positive electrode tabs and negative electrode tabs of the multiple cores are all relatively short, the trouble of adding additional components for conductive connection in the traditional square battery is omitted, the structural design of the square battery is made simpler, the manufacturing cost of the product is reduced, the use is more reliable and safe, and the manufacturing is also more convenient, thus greatly facilitating the automated production and manufacturing of the square battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic structural diagram of the present invention.
[0016] Figure 2 is Figure 1 the top view of.
[0017] Figure 3 is Figure 2 the A-A cross-sectional view of.
[0018] Figure 4 is Figure 2 the B-B cross-sectional perspective view of.
[0019] Figure 5 is Figure 3 the enlarged view at C of.
[0020] Figure 6 is Figure 1 the schematic structural diagram with the combined cover plate opened in.
[0021] Figure 7 is Figure 6 the D-D cross-sectional view of
[0022] Figure 8 is Figure 6 the top view of
[0023] Figure 9 is Figure 6 the perspective view of
[0024] Figure 10 is the schematic top view of the structure where multiple core reels are installed inside a square housing.
[0025] Figure 11 is Figure 10 the E-E cross-sectional view of (rotated 90° counterclockwise)
[0026] Figure 12 is Figure 11 the enlarged view at F of
[0027] Figure 13 is the schematic top view of the structure of the square housing.
[0028] Figure 14 is Figure 13 the perspective view of
[0029] Figure 15 is the schematic view of the structure of the combined current collector plate (bottom surface structure).
[0030] Figure 16 is Figure 15 the G-G cross-sectional view of
[0031] Figure 17 is Figure 15 the enlarged H-H cross-sectional view of
[0032] Figure 18 is the schematic view of the structure of the combined cover plate.
[0033] Figure 19 is Figure 18 the I-I cross-sectional view of
[0034] Figure 20 is Figure 19 the enlarged view at J of Specific embodiments
[0035] The embodiments of the present invention will be further described in detail below with reference to the above-mentioned drawings.
[0036] As Figures 1 to 20As shown, 1. Square housing, 11. Mounting groove, 2. Spool, 21. Positive tab, 22. Negative tab, 3. Combined current collector plate, 31. Positive current collector sheet, 311. Positive conductive sheet, 32. Negative current collector sheet, 321. Liquid inlet hole, 33. Connecting rivet point, 34. Slot hole, 4. Combined cover plate, 41. Explosion-proof valve, 42. Insulating sleeve, 43. Insulating ring, 44. Washer, 45. Liquid injection hole, 5. Bottom plate, 101. Positive current collector post, 102. Negative current collector post, 103. Sealing nail, 104. Positive connection bar, 105. Negative connection bar, 106. Insulating tube, 107. Insulating bottom ring.
[0037] A square battery structure and its manufacturing method can be widely applied to the production and manufacturing of square batteries such as lithium batteries or sodium batteries. The square battery structure mainly includes a square housing 1, multiple spools 2, a combined current collector plate 3, a combined cover plate 4, etc.
[0038] Among them, the outer shape of the square housing 1 is rectangular, a rectangular port is provided at the top of the square housing, the bottom of the square housing is covered and closed by a bottom plate 5, and multiple mounting grooves 11 are provided inside the square housing. Each mounting groove contains a spool 2. That is, when multiple spools 2 are jointly inserted into the square housing through the port at the top of the square housing, the multiple spools 2 will be inserted into the multiple mounting grooves 11 one by one.
[0039] At the same time, the multiple mounting grooves 11 are arranged in a way that they are in rows horizontally and in multiple columns closely adjacent vertically. The horizontal direction is the length direction of the square housing, and the vertical direction is the width direction of the square housing. In this embodiment, as shown in Figure 13 、 Figure 14 a total of two rows of mounting grooves 11 are designed. The first row of mounting grooves has 6, and the second row of mounting grooves has 5. Then the two rows of mounting grooves are closely adjacent vertically. Thus, after the multiple spools 2 are inserted into the multiple mounting grooves 11, they can also form rows horizontally and multiple columns closely adjacent vertically. Therefore, when the multiple spools 2 are inserted into the square housing 1, a more compact layout can be formed, so as to make better use of the internal space of the square housing 1.
[0040] Of course, in actual use, the number of mounting grooves 11 in each row can be more, but usually only two rows need to be designed. The purpose is to make the square battery form a flat long-strip-shaped battery outer shape with a longer length and a width within a certain size range, because this flat long-strip-shaped battery outer shape has a wider application range.
[0041] An insulating bottom ring 107 is provided at the bottom end of each spool 2, and a positive tab 21 and a negative tab 22 arranged on the same side are provided at the top end of each spool 2, and the positive tabs 21 at the top ends of the multiple spools are all on the same horizontal line in the same row, and the negative tabs 22 at the top ends of the multiple spools are also all on the same horizontal line in the same row.
[0042] The described combined current collector plate 3 is provided with a positive current collector piece 31 and a negative current collector piece 32, and the positive and negative current collector pieces are insulated from each other; at the same time, both the positive current collector piece 31 and the negative current collector piece 32 are straight long strips extending transversely, and the positive current collector piece 31 is simultaneously conductively connected to the positive electrode tabs 21 in the same row, and the negative current collector piece 32 is simultaneously conductively connected to the negative electrode tabs 22 in the same row.
[0043] When there are multiple rows of positive electrode tabs 21, correspondingly, there will be multiple pieces of positive current collector pieces 31 with the same number as the number of rows of positive electrode tabs. Each piece of positive current collector piece 31 is correspondingly connected to a row of positive electrode tabs 21, and each adjacent two pieces of positive current collector pieces 31 are conductively connected through a positive conductive piece 311; when there are multiple rows of negative electrode tabs 22, correspondingly, there are multiple pieces of negative current collector pieces 32 with the same number as the number of rows of negative electrode tabs. Each piece of negative current collector piece 32 is correspondingly connected to a row of negative electrode tabs 22, and each adjacent two negative current collector pieces are conductively connected through a negative conductive piece.
[0044] Moreover, if two rows of positive electrode tabs 21 are adjacent, then these two rows of positive electrode tabs can be conductively connected together by the same piece of positive current collector piece 31. If two rows of negative electrode tabs 22 are adjacent, then these two rows of negative electrode tabs can also be conductively connected together by the same piece of negative current collector piece 32.
[0045] In this embodiment, Figure 10 As shown, a total of two rows of cores 2 are provided, and both rows of positive electrode tabs 21 are located on the outermost horizontal straight line, and both rows of negative electrode tabs 22 are located on the innermost horizontal straight line, that is, the two rows of negative electrode tabs are exactly adjacent; therefore, two pieces of positive current collector pieces 31 and one piece of negative current collector piece 32 need to be provided on the bottom surface of the positive current collector plate 3, and the two pieces of positive current collector pieces 31 are located on the outermost side, and one piece of negative current collector piece 32 is located in the middle of the two pieces of positive current collector pieces 31.
[0046] In this way, when the combined current collector plate 3 is installed on the tops of multiple cores 2, the two rows of positive electrode tabs 21 exactly respectively contact the two pieces of positive current collector pieces 31 and are respectively welded and fixed to form a conductive connection. Then, the two pieces of positive current collector pieces 31 also need to be conductively connected through the positive conductive piece 311 so that the two rows of positive electrode tabs 21 can conduct electricity with each other; and the adjacent two rows of negative electrode tabs 22 exactly jointly contact one piece of negative current collector piece 32 and are jointly welded and fixed to form a conductive connection, so there is no need to additionally provide a negative conductive piece.
[0047] The described combined cover plate 4 is provided with a positive current collector post 101 and a negative current collector post 102, and the positive and negative current collector posts are insulated from each other; the described combined cover plate 4 is installed on the top of the combined current collector plate 3 and covers and seals the port of the square shell 1 by means of circumferential welding.
[0048] The described positive current collector post 101 is electrically connected to the positive current collector plate 31 on the bottom surface of the combined current collector plate 3 through the positive connection bar 104 passing through the slot hole 34 on the combined current collector plate 3. The negative current collector post 102 is electrically connected to the negative current collector plate 32 on the bottom surface of the combined current collector plate 3 through the negative connection bar 102 passing through the slot hole 34 on the combined current collector plate 3.
[0049] Therefore, the positive electrode tabs 21 at the tops of multiple wound cores 2 are commonly electrically connected to the positive current collector plate 31, and then the positive current can be led out by electrically connecting the positive current collector plate to the positive current collector post 101. The negative electrode tabs 22 at the tops of multiple wound cores 2 are commonly electrically connected to the negative current collector plate 32, and then the negative current can be led out by electrically connecting the negative current collector plate to the negative current collector post 102.
[0050] Insulating tubes 106 are sleeved outside both the positive connection bar 104 and the negative connection bar 105 to prevent short circuits caused by contact with other conductive components. Moreover, connection rivet points 33 are provided on both the positive current collector plate 31 and the negative current collector plate 32 to facilitate welding and fixing with the positive connection bar 104 and the negative connection bar 105.
[0051] The installation structures of the positive current collector post 101 and the negative current collector post 102 on the combined cover plate 4 are the same. In this embodiment, Figure 5 taking the installation structure of the shown positive current collector post 101 as an example for detailed description, the positive current collector post 101 is installed in the installation hole on the combined cover plate 4, and an insulating sleeve 42 is provided outside the positive current collector post 101. The bottom of the positive current collector post 101 is connected to the positive connection bar 104, and an insulating ring 43 and a washer 44 are provided between the positive connection bar and the bottom surface of the combined cover plate 4 for insulating spacing.
[0052] The combined cover plate 4 is provided with a liquid injection hole 45 for injecting electrolyte and a sealing nail 103 for closing the liquid injection hole, and an explosion-proof valve 41 is also provided to play a protective role. The liquid injection hole 45 in this embodiment is arranged at the center of the combined cover plate 4, and two explosion-proof valves 41 are designed and symmetrically arranged on both sides in the length direction with the liquid injection hole 45 as the center. In addition, since the negative current collector plate 32 is exactly located in the middle of the combined current collector plate 3, in order to make the injection of electrolyte more convenient, a liquid inlet hole 321 facing the liquid injection hole 45 can also be designed on the negative current collector plate 32.
[0053] The manufacturing method of the square battery structure includes the following steps: Step 1: Select a square shell 1 with a reserved port at the top and a closed bottom, and set a plurality of installation grooves 11 in the square shell. Step 2: Install multiple core rolls 2 into multiple mounting grooves 11 one by one, and arrange the multiple core rolls 2 in the mounting grooves in a manner that they are closely arranged in rows horizontally and in multiple columns vertically. The horizontal direction is the length direction of the square housing, and the vertical direction is the width direction of the square housing. At the top of each core roll 2, a positive electrode tab 21 and a negative electrode tab 22 are arranged on the same side. Step 3: Adjust the installation position of each core roll 2 in each mounting groove 11 so that the positive electrode tabs 21 at the tops of the multiple core rolls are all located on the same horizontal straight line in the same row, and the negative electrode tabs 22 at the tops of the multiple core rolls are also all located on the same horizontal straight line in the same row. Step 4: Install a combined current collector plate 3 with a positive current collector piece 31 and a negative current collector piece 32 on the bottom on top of the multiple core rolls 2, and make the positive current collector piece 31 conductively connect to the positive electrode tabs 21 in the same row simultaneously, and the negative current collector piece 32 conductively connect to the negative electrode tabs 22 in the same row simultaneously. Step 5: Connect the positive current collector post 101 on the combined cover plate 4 to the positive current collector piece 31 through the positive connection bar 104 passing through the slot hole 34 on the combined current collector plate 3, and connect the negative current collector post 102 to the negative current collector piece 32 through the negative connection bar 105 passing through the slot hole 34 on the combined current collector plate 3. Then install the combined cover plate 4 on the top of the combined current collector plate 3 and seal the port at the top of the square housing. Step 6: Inject electrolyte into the square housing 1 through the liquid injection hole 45 on the combined cover plate 4. After the injection is completed, seal the liquid injection hole 45 with the sealing nail 103, and the manufacturing of the square battery can be completed.
[0054] For the multiple core rolls 2 of the present invention, the lead-out paths of the positive electrode tabs 21 and the negative electrode tabs 22 are both short. Therefore, the structural design is simpler, the manufacturing cost of the product is reduced, it is more reliable and safe to use, and the manufacturing is also more convenient, thus greatly facilitating the automated production and manufacturing of the square battery.
[0055] The above-described embodiments are only used to illustrate the present invention and not to limit the protection scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present invention.
Claims
1. A square battery structure, comprising a square outer shell (1), a plurality of wound cores (2), a combined current collector plate (3) and a combined cover plate (4). The top of the square outer shell (1) is provided with a port. It is characterized in that, the plurality of wound cores (2) are jointly inserted into the square outer shell (1) through the port. At the top of each wound core (2), a positive electrode tab (21) and a negative electrode tab (22) are arranged on the same side; on the combined current collector plate (3), a positive current collector sheet (31) and a negative current collector sheet (32) are provided, and the positive and negative current collector sheets are insulated from each other; on the combined cover plate (4), a positive current collector post (101) and a negative current collector post (102) are provided, and the positive and negative current collector posts are insulated from each other; the combined current collector plate (3) is installed on the top of the plurality of wound cores (2), and the combined cover plate (4) is installed on the top of the combined current collector plate (3) and covers and seals the port; the positive electrode tabs (21) at the tops of the plurality of wound cores (2) are jointly conductively connected to the positive current collector sheet (31), and then the positive current is led out by conductively connecting the positive current collector sheet to the positive current collector post (101); the negative electrode tabs (22) at the tops of the plurality of wound cores are jointly conductively connected to the negative current collector sheet (32), and then the negative current is led out by conductively connecting the negative current collector sheet to the negative current collector post (102).
2. The square battery structure according to claim 1, characterized in that the plurality of wound cores (2) are arranged in a manner that they are in rows horizontally and in multiple columns closely. The horizontal direction is the length direction of the square outer shell (1), and the vertical direction is the width direction of the square outer shell (2); the positive electrode tabs (21) at the tops of the plurality of wound cores (2) are all located on the same horizontal straight line in the same row, and the negative electrode tabs (22) at the tops of the plurality of wound cores (2) are also all located on the same horizontal straight line in the same row.
3. A square battery structure according to claim 2, characterized in that both the positive current collector sheet (31) and the negative current collector sheet (32) are straight long strips extending horizontally, and the positive current collector sheet (31) is simultaneously conductively connected to the positive electrode tabs (21) in the same row, and the negative current collector sheet (32) is simultaneously conductively connected to the negative electrode tabs (22) in the same row.
4. The square battery structure according to claim 3, characterized in that the positive electrode tabs (21) are provided with multiple rows, and correspondingly, the positive current collector sheets (31) are provided with multiple pieces having the same number as the number of rows of the positive electrode tabs. Each positive current collector sheet (31) is correspondingly connected to a row of positive electrode tabs (21), and adjacent two positive current collector sheets (31) are conductively connected through a positive conductive sheet (311); the negative electrode tabs (22) are provided with multiple rows, and correspondingly, the negative current collector sheets (32) are provided with multiple pieces having the same number as the number of rows of the negative electrode tabs. Each negative current collector sheet (32) is correspondingly connected to a row of negative electrode tabs (22), and adjacent two negative current collector sheets (32) are conductively connected through a negative conductive sheet.
5. A square battery structure according to claim 3, characterized in that two rows of the positive electrode tabs (21) are adjacent to each other, and these two rows of positive electrode tabs are jointly conductively connected by the same positive current collector sheet (31). Two rows of the negative electrode tabs (22) are adjacent to each other, and these two rows of negative electrode tabs are jointly conductively connected by the same negative current collector sheet (32).
6. The square battery structure according to claim 1, characterized in that The described positive current collector post (101) is electrically connected to the positive current collector plate (31) through a positive connection bar (104), and the negative current collector post (102) is electrically connected to the negative current collector plate (32) through a negative connection bar (105). An insulating tube (106) is sleeved outside both the positive connection bar (104) and the negative connection bar (105).
7. A square battery structure according to claim 6, wherein The combined current collector plate (3) is provided with a slot hole (34). The positive current collector plate (31) and the negative current collector plate (32) are both installed on the bottom surface of the combined current collector plate (3). The positive connection bar (104) passes through the slot hole (34) to be electrically connected to the positive current collector plate (31), and the negative connection bar (105) passes through the slot hole (34) to be electrically connected to the negative current collector plate (32).
8. A square battery structure according to claim 1, wherein The combined cover plate (4) is provided with a liquid injection hole (45) for injecting electrolyte and a sealing nail (103) for closing the liquid injection hole, and also provided with an explosion-proof valve (41).
9. A square battery structure according to claim 1, characterized in that A plurality of installation slots (11) are provided inside the square housing (1), and a plurality of winding cores (2) are respectively inserted into the plurality of installation slots (11) in one-to-one correspondence.
10. A manufacturing method of a square battery structure, characterized in that The manufacturing method includes the following steps: Step 1: Select a square housing (1) with a reserved port at the top and a closed bottom, and set a plurality of installation slots (11) inside the square housing. Step 2: Insert a plurality of winding cores (2) into the plurality of installation slots (11) in one-to-one correspondence, and arrange the plurality of winding cores in the installation slots in a manner that they are closely arranged in rows horizontally and multiple columns vertically. The horizontal direction is the length direction of the square housing (1), and the vertical direction is the width direction of the square housing (1). The top end of each winding core (2) is provided with a positive electrode tab (21) and a negative electrode tab (22) arranged on the same side. Step 3: Adjust the insertion position of each winding core (2) in each installation slot (1), so that the positive electrode tabs (21) at the top ends of the plurality of winding cores are all located on the same horizontal straight line in the same row, and the negative electrode tabs (22) at the tops of the plurality of winding cores are also all located on the same horizontal straight line in the same row. Step 4: Install the combined current collector plate (3) with the positive current collector plate (31) and the negative current collector plate (32) installed on the bottom surface on the tops of the plurality of winding cores (2), and make the positive current collector plate (31) electrically connect to the positive electrode tabs (21) in the same row at the same time, and the negative current collector plate (32) electrically connect to the negative electrode tabs (22) in the same row at the same time. Step 5: Connect the positive current collector post (101) on the combined cover plate (4) to the positive current collector plate (31) through the positive connection bar (104) passing through the slot hole (34) on the combined current collector plate (3), and connect the negative current collector post (102) to the negative current collector plate (32) through the negative connection bar (105) passing through the slot hole (34) on the combined current collector plate (3). Then install the combined cover plate (4) on the top of the combined current collector plate (3) and seal the port at the top of the square housing. Step 6: Inject electrolyte into the square housing (1) through the liquid injection hole (45) on the combined cover plate (4). After the liquid injection is completed, close the liquid injection hole (45) with the sealing nail (103), and the manufacturing of the square battery can be completed.